An unopened copy of Nintendo Co.'s "Super Mario 64" sold in 1996 fetched $1.56 million at an auction on Sunday, a record price for a single video game, a U.S. auctioneer said.It broke the previous record set Friday of $870,000 for a sealed copy of Nintendo's "The Legend of Zelda," according to Heritage Auctions in Dallas.The hefty prices reflect a recent rise in nostalgia among collectors for old games.Super Mario 64 for the Nintendo 64 console is known as the series' first three-dimensional action game.Heritage Auctions described the condition of the auctioned copy as "just so breathtaking…READ FULL ARTICLE